Chuck



Nov.l 6, 1923.

H. R. MCCONNELL CHUCK Filed Nov. 7. 1922 gnou/nto@ attorney Feten-ted Nov. 6, 1923..

1SA ,r AVETE-Nr BiaowNiNG nNGiNnnRiNG COMPANY, er RICHMOND, vin-sima, A oonroiia'rioN orvinemm.

CHUCK; Y

Y'Application filed November'f?, 1922.V SerialeNo. 599,587.'

tightly Vclamping the" gripping elements about the tool 'Inthefchucks now commonly employed a Y,

plurality of gripping elementsare -employed having thread sections formed in their outer faces engaged by Vanxinternally threaded rotatable ring whereby they may be moved intoV engagement .with the tool. chucks but a singlef actuating means is with littlelikelihood-of becoming loose during theoperation of the chucks it requires ay Y number of'turns of the sleeve:to move the gripping elements-(a relatively short distance with a consequentl lossof time. It is the usual practice therefore to provide relatively high pitch threads whereby the gripping.

elements'may be rapidly moved into engagement with the tool,but the use of such acon= struction results inthe frequent loosening of they gripping elements.

In a copendingapplication, Serial No.vk 591,536, filed "September-20th, 1922, Ihave disclosed -a chuck having an actuatingvring.:

Y for moving the clamping elements into engagement with the'tool wherein highpitch threads' areempIoyed forrapidity in action;

Vthe :ring being adapted to .partakezof limited longitudinal movement, further means being providedifor moving the ringlongitudinally 'totightly clamp: the grippingeleme'nts in" position without danger of -becoming loose during operation. l VThe lpresent invention is an improvement overmycopendin'g applica- 'tionfabovewmentioned; being simple .in con-.YV struction, and being so designed as to permit i' the:4 supplementary f clamping means to Y be the tool, supplementary means being provided for' mediate vits ends with an annular grooveV "communicating with the-openings 13. vA Y Vring19Fislmounted`in the groove 18, being Y readily operated without the use of ajwrench or other tool."

It yis 'an :im-portant object .of the present iguanas Ean'nv n. iiiocoNNErL,` or RICHMOND, vineiNiA, assieNon'fro 'ri-:in iviccoNNnLLf inventionV toYV providel main actuating vmeans F L for movingthe clamping elements into loose; .engagement with the tool and to provide novel means for tightly clamping the` gripping' elements about the tool, anti-friction means being employedA whereby an eX- tremely tight clamping 'action may be obtained by vmanual operation without the -use of tools. i

Other objects and advantages of this'invention will be apparent from the course of the following description. Y f Y In the' drawings I have hown one embodi ment of the invention; In this showing, Y Figure 1 is aly side elevation of a chuck 'embodying the invention,

Figurel 2 is a centraljlongitudinal sec-v 1" tional view taken .substantially on line 12-2-fof Figure 5, v In such Figure 3 is a detail view of `one ofthe :clamping elements, employed for movingthe'gripping elements, and if the threads employedV are of v slight pitch so that the tool may be tightly clamped' j Figure Lbis a side elevation of .thebody i portion of the device,

- Fi'guref is' a; section Figure'A 2, r

Figure Figure Tis-a bottomplan view of the cap.

Referring to the drawings, the numeral 10 designates the body portion of the device as a whole, mounted upon a rotatable spindle taken on linee-f5 ofY l 6 isa sectional view taken Online' 6-6 ofFigure 2,` and, I

11 driven by a drillpress orzothei` machine; Y

The body portion `10 terminates in a 'tapered lower end 12 and is'provided with a plurality of .downwardly converging openings :13 in which are mounted gripping elements* "14. The' gripping yelements are provided with clamping faces- 15 as showngin]3`igureV 2.- -Theyuipper Vends C16 v'of-V the gripping A elements are reduced as shown and are lpro- Y' vided with relatively high pitchthreads 17 as shown in Figures 2 and 3.

Thebody Yportion 10 is providedfiiitersplitas at`20 to permiti'tto be placed'- inf the groove when"l the device isu assembled. Thev ring .19 is rprovided" with internal threads 21 engaging thev threads Y17 ofthe clamping element.y A sleeve-p22 surroundsV Ymi: i

the ring 19 as shown in Figure 2, having a drivingnfiit; therewith whereby rotation of the sleeve will cause rotation of the ring to move the gripping elements as will be obvious. Asshown in. Figure 2, the. ring l19 is ot awidth somewhat less than the width of the groove 18 wherebyV limited longitudinal movement of the ring andthe sleeve 22 is permitted.

A rotatable sleeve123. surrounds the body .f yportion l0 intermediate the sleeve 22 and the upper end ofthe-body portion. The sleeve 23 is'provided adjacent/its lower end VWith a ballrace '24 having -antirictionballs 25= therein lwhich contact Awith .the upper The :upper face of face or1- the ringgii).

the sleeve 23 causes the latter to move downy wardly. VThe balls ,25, .contacting ,with the upper face of the ring .19, cause the latter to move ydownwardly whereby the gripping elements are clamped,tightlyaboutthetool.`

it has been found .thatpfthe arrangement' of the antifriction balls 25 Aei-nr,l.,. 4 permits the ygripping elements to be clamped i tightly about the tool so that they do not become looseduringtheoperation of the chuck. i

it is to be understood that the form of my invention.herewithshown and described to Ybe taken as a` preferred example of the same, and thaty various changesin the. shape,`

the -sleeve 23 slopes inwardly and down-l wardly as-shown in. Figure2 and' is provided with a plurality of convolute grooves l26 of arcuate crossfsectionl-or a purposeto,

be described. -The upper endof thesleeve 23 ispro-vided with an annular extension4 27 a from.

The upper end of the body. portionizi() is threaded as at 29rforthereception of a having a lug 28 projecting upwardlythere,

L1A chuck comprising a ',bodyiiportion, .means` carried thereby,I for gripping a@ tool,

.actuating. means: for

movingasaid gripping means into loose engagementjwitli sthe gtool, a rotatable sleeve engaging ysaid actuat-ing cap 3() having Yaninternal shoulder 31 adapt- .f edito contactwith the upper .endl ofthe vbody portion. Y When 4they capi: 30 is 4placed in position it is screwed down tightlycwith 'the shoulder 31 :inrnr engagement .with the upper end ofthe body .portion whereby ythe cap forms in eifecta part'fof vthe body portion. As shown in. Figure12, the lowen5 ,portion of the cap is arranged :within k'the extension27 f of the .sleeve 23 andhas anf arcuate extension 32.arranged in .fthe ipath of travel oty the 'lug 28 whereby rotational movement of the sleeve 23 is limited. y'As shownin Figure 7, the lcapf 30 has its lower.

face arrangedsubstantially at right langles tothe axis of the body .portion and'providedwith a. plurality of arcuate convolute grooves 33. 'lVhen thedevice is assembled adjacent the upper face of the sleeve 23and ,the .grooves 33 .extend oppositely tol the grooves 26, antifriction balls34i being arranged in :the Agrooves at their! points. .of intersection, as shown in Figure 6. It will be apparent that when the sleeve 23 is. ro-

tatedirthe ball A.receiving .portion of: the; j grooves v26 and 33 move toward Aor away from the center.

'The operation of the ,device-.is .asvfollows:

voffa tool .within the ygripping elements, the sleeve :23 is rotated to movefthe tballs 34 Ameans and. provided with a cam7 andan kantiif-riction element `mounised- .between saidam and said body portion to movesaid."A gripping elements intofi-rmenga ement .with theltool `upon rotation` of said-s eeve. Y

Y 2. A. chuck comprisinga bodyportiomg ...means carried :thereby for grippingatool,

.actuating means:v .for VVmoving A .said ygripping means intoloose. engagement.i'with itheito'ol,

.a rotatable sleeve engaging. said. actuating means; and. provided-with an=enclosed-cam groove, and an antifriction .ball` mounted-- between said 1 cam groove. .and .said bodyl Jp0rtion.v to move said. grippingf lelemei'itsi into firm engagement. with thestoo-li, upon '.r.ota- 4ltion of said sleeve.

3.A chuck comprising. aibodyapontion, a

plurality of. gripping elements .carried there- .byi iior'glipping. a tool, .roitatableineans-:enthe lower .face of the cap 30 isarranged gaging said grippingelementsffon mowing said-.faces being 'ing lwith said rotatable meansbeiiigeapable of limited longitudinalinoveinent', ..5 a l .rotatable ,l .sleeve surrounding said body -,portion and contactsaid rotatable-f.: means, said; body portionlbeingprovidedjwith an annularex-f .tension Y having. its :lower: fac'e arranged .ad-

jacent the upperface ofsaid-fsleeve, oneiof provided :with acamf groove,

1 and. an antifriction xball,` arranged'iinisaid e l groove yand ,contacting with the' yotlieri ofssaid "f'fWhenl it -is ydesiredto inserty the l shank f aces.

4. .A ehuckcomprising abody portion, a

toward the center.` l'lhesleeve 22 is then b f rotated to rapidly-move `the Vgripping ele-1 andi ithe 34 outwardly. .inclination of :theA upper 'face of plurality [of gj-ripping.. elements lca rrie'ad'therey. for gripping a.tool, rotatable means-"engaging 1said -fgripping elementsieforrmoving themt intov loose engagement.witli'gthe tool, c

said lrotatable means .being capable 4of limited. longitud inal.. movemenhiarotatable 'sleeve surroundingnsaid tbody y.poi-'tionfai;d.contant- 5. A chuck comprising a body portion, a

plurality of gripping elements carried thereby for gripping a tool, rotatable means engaging said gripping elements, for moving them into loosev engagement with the tool, said rotatable means being capable of limited longitudinal movement, a rotatable sleeveY surrounding said body portion an'd contacting with said rotatable means, said body portion being provided with an annular extension having its lower face arranged adjacent the upper face of said sleeve, said, faces being inclined with respect to each and provided with oppositely arranged oonvolute grooves, and antiriction balls ar-V ranged in said grooves to move said gripping elements into rm engagement with the tool upon rotation of said sleeve,

6. A chuck comprising a body portion, a plurality of downwardly converging gripping elements slidably mounted therein .and

adapted' to be clamped about a tool,- said ele*- Inents being provided with relatively highy pitched threads, a rotatable ring having internal threads engagin gripping elements, sai ring being capable the threads on saidk of limited longitudinal movement, a slid able and rotatablefsleeve surrounding said body portion above said ring, antifriotion balls disposed between said ring and said `ses sleeve, a cap carried by said body portion Y andl having its lowler vface arranged adjacent the'upper face of said sleeve, said Jfaces being relatively inclined and provided with oppositely convoluted grooves, and

A antifriction balls arranged in said grooves at their points of intersection. In testimony whereof I affix in p-resence 'of two witnesses.

, Y HARRY R. MCCONNELL. 'v VVitness'es:y Y

Cms. W. CLARK, Y H. Lmmsirons.l

my signature 45 l 

